package com.dnui.seven2.controller;

import com.dnui.seven2.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

/**
 * 文件上传和下载
 */
@CrossOrigin
@Slf4j
@RestController
@RequestMapping("/common")
public class CommonController {

    @Value("${seven2.path}")
    private String basePath;
    /**
     * 文件上传
     * @param file
     * @return
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file){
        log.info(file.toString());
        //原始文件名
        String originalFilename = file.getOriginalFilename();
        String substring = originalFilename.substring(originalFilename.lastIndexOf("."));

        //使用UUID生成文件名，防止重复文件覆盖
        String fileName = UUID.randomUUID().toString()+substring;

        //创建目录对象
        File dir = new File(basePath);
        //判断是否存在
        if (!dir.exists()){
            dir.mkdirs();
        }
        try {
            file.transferTo(new File(basePath+fileName));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(fileName);
    }

    /**
     * 文件下载
     * @param name
     * @param response
     */
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){
        try {
            FileInputStream fileInputStream=new FileInputStream(new File(basePath+name));

            ServletOutputStream outputStream =response.getOutputStream();
            response.setContentType("image/jpeg");

            int len=0;
            byte[]bytes=new byte[1024];
            while( (len=fileInputStream.read(bytes))!=-1){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }
            outputStream.close();
            fileInputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
